Timeout test.

src/email_client.rs

@@ -10,8 +10,12 @@ pub struct EmailClient {
 
 impl EmailClient {
     pub fn new(base_url: String, sender: SubscriberEmail, authorization_token: String) -> Self {
+        let http_client = Client::builder()
+            .timeout(std::time::Duration::from_secs(10))
+            .build()
+            .unwrap();
         Self {
-            http_client: Client::new(),
+            http_client,
             base_url,
             sender,
             authorization_token,
@@ -163,4 +167,31 @@ mod tests {
         // Assert
         assert_err!(outcome);
     }
+
+    #[tokio::test(threaded_scheduler)]
+    async fn send_email_times_out_if_the_server_takes_too_long() {
+        // Arrange
+        let mock_server = MockServer::start().await;
+        let sender = SubscriberEmail::parse(SafeEmail().fake()).unwrap();
+        let email_client = EmailClient::new(mock_server.uri(), sender, Faker.fake());
+
+        let subscriber_email = SubscriberEmail::parse(SafeEmail().fake()).unwrap();
+        let subject: String = Sentence(1..2).fake();
+        let content: String = Paragraph(1..10).fake();
+
+        let response = ResponseTemplate::new(200).set_delay(std::time::Duration::from_secs(180));
+        Mock::given(any())
+            .respond_with(response)
+            .expect(1)
+            .mount(&mock_server)
+            .await;
+
+        // Act
+        let outcome = email_client
+            .send_email(subscriber_email, &subject, &content, &content)
+            .await;
+
+        // Assert
+        assert_err!(outcome);
+    }
 }